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      02-20-2011, 06:26 PM   #3
Captain Chaos
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Drives: cars n stuff
Join Date: Jan 2008
Location: UK

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Not sure on the e90, but it's usually under the bonnet right by the bulkhead under a black plastic cover.

On the e46 M3 it was on the nearside, seem to recall it being on the offside on the e60 M5 under the microfilter assembly.

There's usually a rats nest of wiring in/around it, so be careful if you're poking around.
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